为什么从WCF服务生成的引用在项目之间是不同的？

I have two ASP.NET projects inside one solution in VS. To each project I have added the same WCF service reference and all was good. However just now I have updated the wcf service then updated the wfc service reference in each project. In one project, the Reference.cs contains two partial classes (which good) while the other project after the update only contains one of the partial classes and hence the project no longer builds.I have two ASP.NET projects inside one solution